<b>Best of the inbox: ESPs, judged on deliverability</b>

<b>Best of the inbox: ESPs, judged on deliverability</b>
Feature charts are useless for affiliate senders. What matters is whether the platform tolerates your model and protects shared-IP reputation. The comparisons that actually test that.

⚖️ ESP picks
— EmailToolTester's seed-list inbox-placement tests — they actually send and measure, not just list features. The only ESP comparison with primary data.
— A 'who allows affiliate content' compatibility rundown — most mainstream ESPs quietly ban it; this saves a suspended account.
— Validity's shared-IP-pool explainer — why your sender reputation depends on strangers on cheap plans.

🔁 Migration
— A deliverability-safe ESP migration checklist — warm the new IP before cutting over, never flip overnight.

Saved you ~2 hours. Test placement on a trial before you migrate a real list — features lie, seed tests don't.